I attempted to build a snap on the launchpad builders that used 'source-type: svn'. These builders are behind an authenticated proxy, and it appears svn doesn't like that. Here you can see my snapcraft.yaml part and subsequent build failure: http://paste.ubuntu.com/25565855/ The full build log is available here: https://launchpadlibrarian.net/337431579/buildlog_snap_ubuntu_xenial_amd64_pig_BUILDING.txt.gz I was able to work around this because my source happens to have a git mirror, and git works fine with launchpad builders. I believe the svn source handler needs to include proxy info (if present) in ~/.subversion/servers, as suggested by this SO answer: https://stackoverflow.com/questions/1491180/how-to-configure-a-http-proxy-for-svn